Etymology
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obsessive (adj.)

"of or pertaining to obsession; liable to obsess," 1911, from obsess + -ive. As a noun, "person characterized by obsession," by 1966. Related: Obsessively. Obsessive-compulsive "combining (psychological) obsessions and compulsions" is attested from 1927.

updated on July 26, 2019

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Definitions of obsessive from WordNet
1
obsessive (n.)
a person who has obsessions;
2
obsessive (adj.)
characterized by or constituting an obsession;
obsessive gambling
Synonyms: obsessional
From wordnet.princeton.edu, not affiliated with etymonline.